Method of casting car-wheels



(188180881.) I Y W'. WILMINGTON.

' METHOD 0I' CASTING CAR WHBELS.

No. 281,422. Patented July 17, 1888.

INVBNTOR ATTORNEYS.

N. PETERSymm-Umngnphnr, washington. nA C.

UNITED STATES PATENT OFFICE.

WILLIAM WILMINGTON, OF TOLEDO, OIIIO.

METHOD OF CASTING CAR-WHEELS.

SPECIFICATION forming part of Letters Patent No. 281,422, dated July 17, 1883,

Application filed June 1R. 1883. (No model.)

-method of casting car-wheels upon which Letters Patent of the United States have been granted me, No. 273,658, dated March 6, 1883, which patented method consisted in nearly or quite filling a mold for a car-wheel with suitable chill-hardening iron, then immediately placing in the receiving-basin of the mold a small quantity of finely-powdered ferro-Inanganese or its equivalent, allowing the same to be melted and disseminated through the molten iron in the basin, then pouring a small quantity of molten iron into the basin, causing a partial displacement of the iirst iron poured out of the mold through proper openings in the same. This method of casting carwheels produces beneficial results; but it is expensive, because of the waste of metal attending its discharge from the mold and the trouble and cost of caring for the same.

To avoid this expense and lessen the labor in molding the wheel, and still soften the inner parts of the same when casting by an admiXture of another quality of metal in the central portions of the wheel, is the object of my improvement.

It consists in nearly or quite lling the mold ofany form of a car-wheel with suitable chillhardening iron. Then immediately after the mold is filled, or whenthere is a Very small space in the same not filled, I place in the central receiving-basin about a pound of ferromanganese inely powdered, having a large percentage of silicon and carbon in its composition, immediately stirring the same with the molten iron remaining in the basin, causing the metals to combine by fusion, and at intervals inserting a small rod of iron in the openings in the bottom of the basin leading into the mold, and imparting to the rod upward and downward movement, (which experts in casting term churning.) This will for a short time prevent the molten iron in the openings Vfrom being solidiiied, thereby permitting the melted and disseminated ferromanganese in the molten iron in the basin to be diffused downward through the openings in the mold, aided in its downward movement by the churning-rod and the contraction ofthe molten iron forming the hub, which is incident to bodies of molten metals commencing to cool. The admixture of the ferro-manganese by diffusion and combination with the molten iron at the central parts of the wheelmold will prevent the same from being too hard and rigid by too sudden cooling when coming in contact with the cold compact cores and moist sand of the mold, thus facilitating the boring of the hub and lessening the liability ofthe same to fracture when pressing the wheel on the axle. I prefer to use in soften ing the hub and inner plates of the carwheels ferro-manganese, because it takes less to produce the desired results. In some qualities of chill-hardening irons I use'linely-powdered spiegeleisen in larger quantities instead of the powdered ferro-manganese. In other qualities of chill-hardening cast-iron I use to advantage small particles of cast-iron derived from borings, turnings, drillings, or lilings, or otherwise, the same produced from cast-iron made from argillaceous or black-band iron ores. Of these I use still greater proportions in mixing with the chill-hardening iron. In still. other qualities of chill-hardening cast -iron I use to soften the hub and inner plates a combination of all or any part of the above-named powdered or small particles of cast-iron ferrolmanganese Or spiegeleisen in such proportions as practice will show produces the best results. In the use of some ofthe different quali` ties of vchill-hardening irons I obtain better rcsults by placing the above-named metals in the pouring-ladle, with the molten iron in the same, and allowing it to be melted by contact with the said molten iron in the ladle, then pouring the compound immediately into the basin, and th en manipulating the churning-rod, as has been described.Y

The drawing represents a cross-section of a single-plated car-wheel mold.

A shows the receiving-basin.

B represents two or more openings in the bottomV of the basin leading into the mold.

I disclaim as my invention in this application the method of casting car-wheels from two different qualities of molten irons poured IOO separately into the mold7 when the saine is melted in separate cupolas or furnaces.

I also disclaim the invention of the mold and its appliances; also the forni ofthe wheel.

I furthermore disclaim as my invention all methods of alloying molten iron or steel by an adniixture of ferro-manganese7 spiegeleisen, or metals made from argillaccons iron ores7 When the same is melted in furnace cupola or crucible, for this is common.

I also disclaim as myinvention the churning, as it is termed, of the molten metal leading` into molds7 for this is common in casting.

Ihat I claim as my invention is- The method of casting car-wheels7 which consists in nearly or quite filling the mold of the wheel with suitable chill-hardening castiron, then placing in the receiving-basin of the mold finely-powdered ferro-1nanganese or its equivalent7 as described, allowing the same to be melted by the molten iron remaining in the basin, and then agitating the iron remaining in the basin and keeping the inlet-l1oles open by churning, substantially in the manner and for the purpose heretofore described.

VILLIAM WILMINGTON.

Witnesses:

ALEXANDER XVEBER, LlNcoLN HAYES. 

